221242095 has 36 divisors (see below), whose sum is σ = 392759640. Its totient is φ = 115208352.

The previous prime is 221242051. The next prime is 221242103. The reversal of 221242095 is 590242122.

It is a happy number.

It is not a de Polignac number, because 221242095 - 2¹⁵ = 221209327 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 81876 + ... + 84534.

It is an arithmetic number, because the mean of its divisors is an integer number (10909990).

Almost surely, 2^221242095 is an apocalyptic number.

221242095 is a deficient number, since it is larger than the sum of its proper divisors (171517545).

221242095 is a wasteful number, since it uses less digits than its factorization.

221242095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756 (or 2710 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 221242095 is about 14874.2090546019. The cubic root of 221242095 is about 604.8150471686.

Adding to 221242095 its sum of digits (27), we get a palindrome (221242122).

The spelling of 221242095 in words is "two hundred twenty-one million, two hundred forty-two thousand, ninety-five".